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Provide step by step proof explanation below set statements: Proving results involving sets. (7) Prove or disprove: If ACB then BCA. (8) Let A, B.

Provide step by step proof explanation below set statements:

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Proving results involving sets. (7) Prove or disprove: If ACB then BCA. (8) Let A, B. C, and D be sets with C C A and D C B. Prove or disprove: D-AC B - C. (9) Let A, B, and C be sets. Prove or disprove: If An CC BNC then ACB

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